Overall i was not that impressed with this lens. Images do need some processing in PS to get the most out of them. I also hate the MF ring on this lens. BTW if your thinking of getting this for your 1.6x DSLR...32-56mm is not a very good range for most people. Id only recomend it for FF cameras.

Aside from the flare, noisy AF, and stupid filter system...i love this lens. I've used this lens on my 1Ds for commerical use for years and have had no compaints....as long as you control the flare that is. Also works well on my 20D camera body.

Close to the Sharpness and contrast of my 28-70L...actually got it as a backup for that lens. I found myself taking it along on most shoots because of its small size/weight. Build is very solid for the price...not L quality but still excellent.

Cons:

no distance scale, no HSM, only 24mm lock, broke hood first day(sigma did replace it free of charge though)

Great lens for those looking for L-ish quality on a budget or as a backup. For the price you can't go wrong...although i did end up selling this lens for the popular 24-70 2.8 Sigma EX because of its larger range.